75Re186.21
Rhenium (Re)
Element 75 · Transition metal
Rhenium (Re) is a chemical element with atomic number 75. It is classified as a transition metal in period 6, group 7 of the periodic table (the d-block). Its standard atomic weight is 186.21 u and its ground-state electron configuration is [Xe] 4f¹⁴ 5d⁵ 6s².
Rhenium facts
| Atomic number (Z) | 75 |
|---|---|
| Symbol | Re |
| Standard atomic weight | 186.21 u |
| Category | Transition metal |
| Group | 7 |
| Period | 6 |
| Block | d-block |
| Electron configuration | [Xe] 4f¹⁴ 5d⁵ 6s² |
| Electronegativity (Pauling) | 1.9 |
| State at 20 °C | Solid |
| Protons / electrons | 75 / 75 |
| Neutrons (most common isotope, approx.) | 111 |
| Molar mass | 186.21 g/mol |